Wrench.



Nu. 642,55. Patented Ian. 30, I900. G. REDFORD & E. CAMPBELL.

WRENCH.

(Application filed Septffi, 1899.) (H o M o d a I Witnesse Inventors m5 ucnms vz zas co, PNOTO-UTHQ, WASHINGTON a. c.

litre STATES PATENT FFICE.

GEORGE REDFORD AND EDlVIN CAMPBELL, OF SUSSEX, VISCONSIN.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 642,1 55, dated January 30, 1900. Application filed September 5, 1899. Serial No.'729,419. (No model.)

To (tZZ 2072,0722 it may concern:

Be it known that we, GEORGE REDFORD and EDWIN CAMPBELL, citizens of the United .States, residing at SusseX, in the county of \Vaukesha and State of Wisconsin, have invented new and useful Improvements in Ad justable renches, of which'the followingis a specification. v

Our invention relates to improvements in adjustable wrenches; and it pertains to a device for locking the movable jaw of the wrench at any desired point of adjustment.

The construction of our device is explained by reference to the accompanying drawings, in which-- Figure 1 represents a side view thereof with part broken away to show the interior construction. Fig. 2 is a cross-section drawn on line a: as, and Fig. 3 is a cross-section drawn on line y y of Fig. 1.

Like parts are referred to by the same reference-letters throughout the several views.

A represents the handle.

13 is the shank; G, the stationaryjaw,which jaw is rigidly secured to the shank B.

D is the adjustable jaw, which is loosely fitted to the shank B, upon which it is adapted to be moved and adjusted. The jaw D is locked at the desired point of adjustment on the shank by the screw E. The screw E is supported at one end at a fixed point from the shank B by the bracket F and at its opposite end in a screw-threaded bearing G, formed therefor in the movable jaw D. The bearings of the screw E and the pitch of the screw-thread are such as to permit the screw when not locked to be turned freelyin either direction by the action of the screw-threaded bearing G and by the movement of the jaw D as it is being adjusted. When the jaw D has been moved to the desired point of adjustment, it is rigidly locked at such point by locking the screw E. It is obvious that the screw E may be locked and prevented from turning in a great variety of ways; but as a preferable form of locking device we employ a beveled pinion or collar H, which is rigidly secured to the screw and normally retained in contact with the bracket F by the bearingspring J. The bearing-surface of the bracket F is beveled to conform to the beveled surface of the pinion, and the contiguous surfaces of both are provided with teeth (5r corrugations I, which interlock together and prevent the screw E from turning. The pinion H is driven back and held normally in contact with the bracket F by the recoil of the spring J,which is interposed between the bracket and sliding lock. The sliding lock K is swiveled to the protruding end of the screw E by the retaining-pin L. Thus the block K serves as a bearing for the hand of the operator, by which the screw E and pinion H may be moved forward and the pinion H thrown out of engagement with the inclosing bracket. Thus it is obvious that when desired to adjust the movable jaw in either direction it is necessary simply to press against the block K, whereby the pinion will be disengaged from the bracket, when the screw E will be free to turn, thus permitting the jaw to be moved freely in either direc tion. When the jaw has been adjusted, it is automatically locked by the recoil of the spring J acting against the sliding block K as such block is released from pressure. To prevent the block K from turning with the screw as the jaw is being adjusted, its lower edge is brought in cont-act with the base of the bracket F.

Having thus described ourinvention,what we claim as new, and desire to secure by Letters Patent, is-- 1. In a wrench, the combination with a movable jaw and a supporting-shank; of an ad j usting-screw having threaded bearings in the bearings of the movable jaw, the pitch of the thread of said screw and the bearings, being such as to cause said screwto be turned by the longitudinal movement of said jaw; and means for locking said screw and jaw at the desired point of adjustment.

2. In a wrench, the combination with a movable jaw and a supporting-shank; of an adjusting-screw having threaded bearings in the bearings of the movable j aw, the pitch of the thread of said screw and the hearing being such as to cause said screw to be turned by the longitudinal movement of said jaw; and means for locking said screw and jaw at the desired pointof adjustment, consistingof a stationary bracket F; pinion 11 having bearings in said bracket; bearing-block K swiveled to one end of said adjusting-screw; and

spiral spring or elastic bearing J interposed our hands and aiiixed our seals this 28th day between said stationary bracket and said of August, 1899.

block, adapted when released from pressure GEORGE REDFORD. P. 5.]

to hold said pinion in contact with said EDWIN CAMPBELL. L. 8.] 5 bracket, all substantially as and for the pur- Witnesses pose specified. L. 0. WHEELER,

In witness whereof we have hereunto set F. A. OTTO. 

